Specification :

The 3CX3000A7 high-mu forced air cooled power
triode provides relatively high power output as
an amplifier, oscillator, or modulator at low plate
voltages. The tube has a low inductance cylindrical
filament tank circuit for VHF operation. Operation
with zero grid bias in many applications offers
circuit simplicity by eliminating the bias supply.
Grounded-grid operation is attractive since a
power gain of over twenty times can be obtained.
Characteristics:
Plate Dissipation ( Max.) 4, 000 Watts
Screen Dissipation ( Max.) ---
Grid Dissipation ( Max.) 225 Watts
Frequency for Max. rating ( CW) 110 MHz
Amplification Factor 160
Filament/ Cathode Thoriated Tungsten
Voltage 7.5 Volts
Current 51.5 Amps